We need 4 players, Left back, centre half, central midfielder as a Fernandinho alternative and a winger/striker. I anticipate us filling one of these positions at most in January though and the rest in the summer. That one position most likely being at centre back. He seems to have given up on Kompany, we simply can't rely on him. I'm a Mangala fan but Pep clearly has limited faith in him, Tosin is doing alright but isn't quite at the level at the minute, which leaves just Otamendi and Stones which as we've seen, one injury leaves us seriously lacking. I don't think he wants to risk being that weak in that position towards the end of the season.
All the rest can wait unless our prime targets are available which is unlikely. At left back, after the success of Delph, i think he'll stick with what we've got for now, Delph as 1st choice and if he were to become unavailable, Danilo and zinchenko as the alternatives. It could be a gamble too far trying to do what he's done with Delph to Zinchenko but i think we'll risk it.
I can't see a midfielder coming in either, he trusts Fernandinho's fitness and we've got Gundogan and Yaya as cover for now. Fernandinho will get more rest towards the end of the season to ensure he's available for the big games.
On the wings i don't see us adding, 1 injury to Sterling/Sane could leave us somewhat 1 dimensional and lopsided but it's not a priority right now and we can wait until the summer unless Sanchez is available at a cut price fee. Him being available for the champs league could sway Peps decision on that one though.